Dude save your money and chance battery yourself. I disconnected battery million times before and all i needed to do is "relearning window position". I bought Bosch group size 48 battery from Pepboys. It fits like glove and has 3 year warranty.
Alright so i picked up a bosch 750 cca battery and threw that in her on another -10 F day, cycled the glow plugs once and she fired up like it was a mid summer day. Hasnt given me any trouble since and its been nothing but cold here.
Purchased a Red Top 35 today and it fits! I did have to take the bottom bracket and flip it so that the side of the battery facing the headlight [+ -] stayed secure.
I'm using a Bosch Group 48 battery (it is 26 months old now) from Pep-boys. Their testing machine result says 'good battery' The guy at the store said, it was as good as a new one.
new bosch battery
I ended up buying a red top optima gel battery....expeeeensiiiive
I had a red top in my mk5 after the OEM one took a dump. It worked very well without any issues.
I just threw in a red top in the G60 and it did not fit well at all. The optima website mentioned some sort of adapters that were supposed to fit on the long edges of the battery to make it fit better under the battery holder, but I did not get any with my battery. I ended up shimming it to get it snug.
Optima batteries have slowly gone to shit since they were bought by Johnson Controls.
Their batteries have never been great, and they've always failed prematurely for myself and several others.
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